Government comprises the set of legal and political institutions that regulate the relationships among members of a society and between the society and outsiders. These institutions have the authority to make decisions for the society on policies affecting the maintenance of order and the achievement of certain societal goals. This article provides an overview of the types of government, the ways authority can be distributed, the divisions of government, and the functions of government. Separate articles deal with the origins and development of the concept of the state, the theoretical and practical development of representation, law, and the study of government (see political science).
The power of a government over its own citizens varies, depending on the degree to which it is free of limitations and restraints. The power of a government abroad also varies, depending on the human and material resources with which it can support its foreign policy. Governments range in size and scope from clans, tribes, and the shires of early times to the superpowers and international governments of today. Until recent times some governments were strong enough to establish empires that ruled not only their own people but other peoples and states across national, ethnic, and language boundaries. The present-day counterpart of the empire is the superpower that is able to lead or dominate other countries through its superior military and economic strength. Within the modern nation-state, government operates at many different levels, ranging from villages to cities, counties, provinces, and states.